Micro RC Car Electronics

Projects General Guidance
1

Hello guys. First of all i want to present myself to you. My name is Fabrizio and i enjoy myself by designing CAD projects and printing via 3D printer. My new project is a 1/32 RC CAR , i have designed the chassis, tramissione and steering , but have very High doubts about Electronics. Im new to this world and i just began to learn. The main problem in this project is that i need very small electronics to fit my chassis , because is very unique and clever design . It Will run 130 DC motor and small 9g servo . So my goal is to make a small and cheap radio system that operates steering servo and motor. What electronics do you think i should use ? I know i need :

-Arduino main board

-Radio receiver/transmitter

-Motor driver

-Servo driver

For the main board what do you suggest? Arduino nano ? There is something smaller ?

For the radio my eyes fell off on NRF24 Mini SMD Wireless Module that is smaller version than conventional nrf 24l01 module.

For the motor driver , i have a single brushed motor so , i know That there are many DRV's motor driver , but , which to pick?

And servo controller ?

I need your help. Thank you very much for the attention and for understand.

Thank you ,

Fabrizio

2

Very modest.

Is there something wrong with the commercially available micro RC systems?

3

Not at all, but i want to do all by myself just because i want to learn and that give me pleasure to me

4

Right.

Well maybe look at the 433Mhz devices available.

Have an ATTIny85 do the hard graft...small package and yeah. It is an ATMEL chip and is easily programmable using say a USBASP programmer or even using an Arduino UNO.

A few resistors, transistors and caps and an ATtiny with the 433Mhz receiver may be small enough for your needs. The ATTiny85 has some PWM pins you may find useful.

5

Attiny only has 6 IO pins, that could be limiting.
I'd go with a Promini for a full serial port, and IO to control the other things, yet still small in size.
As little as $4 it seems if you don't mind the wait.
https://www.amazon.com/gp/search/ref=a9_sc_1?rh=i%3Aaps%2Ck%3Apro+mini+arduino&keywords=pro+mini+arduino&ie=UTF8&qid=1492573345

6

How much space (in millimetres) have you for the Arduino / radio gear?

I am putting an nRF24L01+ and an Attiny 1634 and a Pololu DRV8833 motor driver into a 00 Gauge (1:76) model train locomotive.

In my latest version I have sawed the PCB antenna off the nRF24 and am using a short piece of wire for the antenna. That reduces the length of the board by about 7mm. This is a photo of the earlier version with the full sized nRF24 and without the motor driver.

DSCF4525 cropped.jpg
DSCF4525 cropped.jpg1872×1072 298 KB

And if you want a very small RC system and are prepared to pay about £30 for the in-car part have a look at the Deltang website. I used some of them in N Gauge model trains

...R

7

Hi,

It Will run 130 DC motor and small 9g servo

What motor?
What is your power source?
Can you post a picture of your RC car?
How big is it 1/32 scale?
Morris Minor Low Light is smaller than a Ford Mustang, even in 1/32

Thanks Tom.... :slight_smile: